Smeltr
Fast, self-hosted telemetry pipelines. Built visually. Managed with Git.
Smeltr moves logs, metrics and events from your sources to your destinations and changes them on the way: filter, parse, enrich, route. You build each pipeline in a browser, test it on samples captured from the live stream, and deploy it as a Git commit, so every change is reviewed before it runs and can be rolled back after.
Get it
docker pull ghcr.io/smeltr-sh/smeltr:latest
Linux and Windows archives, checksums and the SBOM, STIG and CVE reports are on the download page. The install guides take a leader from a fresh install to rows flowing.
Documentation
Build from source
Stable Rust, Node 22 and just; the native dependencies also need a C and C++ compiler, CMake and Go, as the Dockerfile installs them. Docker runs the live checks and builds the release archives.
just build # frontend, then an optimized binary with it embedded
just run # the same, started
just build-dev # frontend, then an unoptimized binary: what the GUI tests run, and quick to rebuild
just run-dev # the same, started
just check # what the files changed since origin/main can break; run before every push
just --list # everything else
| directory | holds |
|---|
src/ | the engine, leader and worker |
gui-frontend/ | the leader's browser interface |
website/ | smeltr.sh, its documentation and function reference |
tests/ | integration, GUI and live tests, and their fixtures |
docs/ | design and architecture |
tools/ | the citation checks and release tooling |
bench/ | throughput benchmarks |
License
Business Source License 1.1. Production use is free for individuals and for organizations with fewer than 250 employees; larger organizations buy a license. Evaluation, development and testing are free for everyone. Each release becomes Apache 2.0 four years after it ships.
